Here's the discussion going on at Pinkpeas right now. Car seats are fun, right? Not really. Necessary, but such a pain to find the right one and install it properly in your car. Just when you've got one down, along comes another baby and now you're fitting two in a car. Then, you're pregnant with baby #3. Wait - how do I fit three car seats in my little car?!? We have two pregnant mamas here in this exact situation. Buying a bigger car isn't really an affordable option. Here's a site that might help.
